Abstract：Demand to rigorously enforce the systems of the linear phase place, need to adopt FIR digital filter. The method to design FIR filter have window function algorithm, frequency sample algorithm Parks-McClellan algorithm.Parks-McClellan algorithm as optimization design most among them.. Its principle is to use the greatest error to minimize criterion, make FIR digital filter that design frequency characteristic and ideal filter frequency characteristic greatest error minimum most frequently, make range of it in passband and hinder fluctuation of having etc. in taking, The error is distributed evenly in the whole frequency band. There is a remez function in Toolbox of MATLAB, It realizes Parks-McClellan algorithm, This kind of algorithm utilizes remez to exchange France and Chebyshev and is similar to the theory to design the filter, it is actual frequency that is it fit frequency respond and up to optimizing most to respond.
Keywords: FIR digital filter； Window function； MATLAB； Remez function；
Parks-McClellan algorithm
